[PATCH v4 2/2] [media] s5p-mfc: Add support for resolution change event

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From: Pawel Osciak <posciak@xxxxxxxxxxxx>

When a resolution change point is reached, queue an event to signal the
userspace that a new set of buffers is required before decoding can
continue.

Signed-off-by: Pawel Osciak <posciak@xxxxxxxxxxxx>
Signed-off-by: Arun Kumar K <arun.kk@xxxxxxxxxxx>
---
 drivers/media/platform/s5p-mfc/s5p_mfc.c     |    7 +++++++
 drivers/media/platform/s5p-mfc/s5p_mfc_dec.c |    2 ++
 2 files changed, 9 insertions(+)

diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc.c b/drivers/media/platform/s5p-mfc/s5p_mfc.c
index 54f7ba1..2d7d1ae 100644
--- a/drivers/media/platform/s5p-mfc/s5p_mfc.c
+++ b/drivers/media/platform/s5p-mfc/s5p_mfc.c
@@ -320,6 +320,7 @@ static void s5p_mfc_handle_frame(struct s5p_mfc_ctx *ctx,
 	struct s5p_mfc_buf *src_buf;
 	unsigned long flags;
 	unsigned int res_change;
+	struct v4l2_event ev;
 
 	dst_frame_status = s5p_mfc_hw_call(dev->mfc_ops, get_dspl_status, dev)
 				& S5P_FIMV_DEC_STATUS_DECODING_STATUS_MASK;
@@ -351,6 +352,12 @@ static void s5p_mfc_handle_frame(struct s5p_mfc_ctx *ctx,
 		if (ctx->state == MFCINST_RES_CHANGE_FLUSH) {
 			s5p_mfc_handle_frame_all_extracted(ctx);
 			ctx->state = MFCINST_RES_CHANGE_END;
+
+			memset(&ev, 0, sizeof(struct v4l2_event));
+			ev.type = V4L2_EVENT_SOURCE_CHANGE;
+			ev.u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION;
+			v4l2_event_queue_fh(&ctx->fh, &ev);
+
 			goto leave_handle_frame;
 		} else {
 			s5p_mfc_handle_frame_all_extracted(ctx);
diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c b/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
index 4f94491..b383829 100644
--- a/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
+++ b/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
@@ -855,6 +855,8 @@ static int vidioc_subscribe_event(struct v4l2_fh *fh,
 	switch (sub->type) {
 	case V4L2_EVENT_EOS:
 		return v4l2_event_subscribe(fh, sub, 2, NULL);
+	case V4L2_EVENT_SOURCE_CHANGE:
+		return v4l2_src_change_event_subscribe(fh, sub);
 	default:
 		return -EINVAL;
 	}
-- 
1.7.9.5

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